Chemistry Middle School

Which of these is a balanced chemical equation?


2Ca + O^2 → 2CaO

Ca + O^2→ CaO

Ca + 2O^2 → 2CaO

2Ca + O^2 → CaO

Answers

Answer 1

Answer:

The first one: 2Ca + O^2 → 2CaO

Answer 2

Answer:

first option -> 2Ca + O^2 → 2CaO

Explanation:

hope this helps

Related Questions

Help asap, answer the question 1 by 1 I need help

Answers

Answer:

2 atoms of pb

4 atoms of br

2 molecules

Explanation:

EZ

The number of atoms in a grapefruit would be equivalent to

Answers

Answer:

The answer Is B!

Explanation:

...............

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option B.

What is atom?

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The number of atoms in a grapefruit would be equivalent to the number of blueberries in the house.

The correct option is option B.

To know more about atom, here:

https://brainly.com/question/13518322

#SPJ2

An object resting on top of a building has the most potential energy ....

before it stops moving
when it stops
objects cannot have potential energy
before it stops moving

Answers

Answer:

when it stops

Explanation:

potential energy is pretty much energy being stored when an object is inactive or not moving

I believe this is right-

An atom is mostly made up of... *
Empty space
Heavy electrons crowding the nucleus
A massive nucleus surrounded by clouds of electrons and protons
A massive nucleus consisting of electrons, protons, and neutrons

Answers

A massage nucleus consisting of electrons, protons, and neutrons
D, a massive nucleus consisting of electrons, protons, and neutrons.

You and your friends decide to travel, on foot, to your favorite beach at the Jersey Shore. Your speed for the first part of the trip is 2.2 mi/hr. Twenty-three minutes after starting your trip, the group decides to stop at a convenience store for a drink. After stopping at the convenience store for five minutes, you continue your travels for 0.9 hour and then stop at a local fast-food restaurant for a bite to eat. You spend 20 minutes eating your favorite burger and 480 seconds after continuing your journey, you stop to use the restroom for 0.5 hr. Now that everyone feels a little lighter, the group increases its speed to 5.5 km/hr and spends the next 900,000 milliseconds traveling to a friend’s beach house to get sun block. After spending five minutes getting the sun block and raiding your friend’s pantry for snacks, the group starts “fist-pumping” in anticipation of their arrival at the beach. Eleven minutes and twenty five seconds later, you and your friends finally feel the warm sand beneath your feet. Approximately how many miles away is the beach?

Answers

Answer:

Sorry dont know

Explanation:

It is 12:00 and you just heard that local officials are tracking a violent storm heading westward, directly for your town and school. The storm is traveling at 25 km/hr and it is currently 75 kilometers east of your school. If the school day is not shortened, and you remain until two o’clock (the official end of the day), will you and all others in the school get home before the storm hits?

...Your Welcome!!

**URGENT**** Which group of elements has the highest boiling point? *

IIIa (13)
IIa (2)
Ia (1)
IVa (14)
Transition metals

Answers

Answer:  the elements that have the hightse boiling is trnsition metals

xplanation:

I think transmition metals as These properties are due to metallic bonding by delocalized d electrons, leading to cohesion which increases with the number of shared electrons.

What forces are present in this situation?

An elevator is rising at a constant speed; the elevator is the object in this situation.


gravity


normal, gravity, and tension


gravity and tension


normal and tension

Answers

Answer:

gravity and tension i believe is the answer HOPE THIS HELPED

Explanation:

Gravity and tension sound about right

A bird flies at a speed of 15 m/s for 10 seconds, 1,200 m/min for 0.17 minute, and 2,500 cm/s for 5,000 milliseconds. What is the bird’s average speed?

Answers

Answer:

Explanation:

average speed=distance travelled/time taken

distance=speed*time

15*10=150 m

1200 m/min=20 m/s

0.17 minute=10.2 seconds

20*10.2=204 m

2500 cm/s=25 m/s

5000 milliseconds=5 seconds

25*5=125 m

125+150+204=479 m

10.2+5+10=25.2

479/25.2=19.0

15 m/s for 10 sec; distance covered = (15 x 10) = 150 m
Second segment:
20 m/s for 20 sec; distance covered = (20 x 20) = 400 m
Third segment:
30 m/s for 15 sec; distrance covered = (30 x 15) = 450 m
Total time = (10s + 20s + 15s) = 45 sec
Total distance = (150m + 400m + 450m) = 1,000 m (1 km)
Average speed = (1,000 m) / (45 sec) = 22.22 m/s ...

A trapezoid is broken into 2 triangles and 1 rectangle. The rectangle has a base of 1 meter and height of 4 meters. Both triangles each have a base of 2 meters and a height of 4 meters.
A trapezoid was broken into a rectangle and two equal triangles.

The base of each triangle b is __ m.
The area of the rectangle is __ m2.
The area of each triangle is __ m2.
The area of the trapezoid is __ m2.

Answers

Answer:

2, 4, 4, 12!

Explanation:

The base of each triangle b is

✔ 2

m.

The area of the rectangle is

✔ 4

m2.

The area of each triangle is

✔ 4

m2.

The area of the trapezoid is

✔ 12

m2.

Answer:

20

21

less then

brainly pls

-Watch the video

-Answer the following question. Make sure you site evidence. Make sure you use complete sentences.

Question:

Are fires always bad in the environment? Why?

-Please don't just say yes or no because
(How Wildfires Help! | Science for Kids)
^video is by SciShow Kids ^

Answers

Answer:

maybe you should watch the video...

we can't help you because we don't have the vid.

Explanation:

I think fire is bad for the environment because fires can spread and they damage things in their path, smoke is also really bad. If you inhale too much you can die from it. And it’s very foggy and gives you a hard time breathing as well.

What is a negative impact of resource use?

Answers

Burning fossil fuels, deforestation, overpopulation, polluting, and much more. Hope this helps:)
overpopulation is believed that it will lead to climate change and animal extinction as time goes on. the burning of fossil fuels will lead to climate change, then that will go onto a cycle of sea levels rising, air pollution and animal extinction.

Which one of these objects has potential energy ? Can someone plzzzz help me out!!!

Answers

C

because the energy is stored in an object
C because the ball has more mass

The further away from the sun a planet is, the hotter it is.

True
False

Answers

Answer:

False

Explanation:

The farther away a planet is, the colder it is.

the anwser is true

Explanation:

i don't like to really explain but that's the anwser it relies on its orbit

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